Abstract
With transition metal (TM) complex cations as structure-directing agents (SDAs), one type of new organic-inorganic hybrid iodoargentates, namely, [TM(2,2-bipy)3]Ag5I7 (TM=Zn, Ni, Co), have been solvothermally synthesized and structurally characterized. All the title compounds contain one-dimensional (1D) [Ag5I7]2− chains composed by [Ag5I10] units based on [AgI4] tetrahedra, which are interconnected by [TM(2,2-bipy)3]2+ via hydrogen bonds to form 3D supramolecular networks. The UV–vis diffuse-reflectance measurements reveal that the compounds possess semiconductor behaviors with band gaps of 1.94–2.58eV tuned by different TM complex cations. The title hybrid materials feature stable photocatalytic degradation activities over organic pollutants under visible light irradiation mainly originating from the electron absorption abilities of TM complex cations. Based on radical-trapping experiments and electronic band structural calculation, the possible photocatalytic mechanism and photochemical stability is also proposed.
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